private async void ModifyButton_Click(object sender, RoutedEventArgs e)
{
var dialog = new AddOrModifyDevice((Device)DevicesListView.SelectedItem);
await DialogHost.Show(dialog, "DeviceDialog");
}
private async void AddButton_Click(object sender, RoutedEventArgs e)
{
var dialog = new AddOrModifyDevice();
await DialogHost.Show(dialog, "DeviceDialog");
}